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From: Florian Weimer <fw@deneb.enyo.de>
Newsgroups: comp.lang.ada
Subject: Re: POSIX.Memory_Mapping.Map_Memory
Date: Sun, 30 Jan 2005 19:51:58 +0100
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* Mark Lorenzen:

>> I was just wondering: Is it allowed to map a device file as shared
>> memory? Try to use MAP_PRIVATE instead of MAP_SHARED.
>
> Furthermore: I do not think that it is possible to map character
> special files, since it only allows sequential access. You can
> probably only map block special files.

It's possible to map /dev/zero.  In fact, there is little difference
between character and block devices these days.